The property gets overwritten during on state change.

[yyesyyesyyes]

I have simple drawing tool with

[Browsable(false)]
public bool MyProp {get;set;}

public MyDrawingTool(bool myProp)
{
 MyProp = myProp;
}

// from add-on
var myDrawingTool = new MyDrawingTool(true);
ChartControl.TryStartDrawing(myDrawingTool.GetType().FullName);

It always overwrite the MyProp to its default value and it is always false

What should I do to prevent MyProp being changed?

[yyesyyesyyes]

Also I added few events to drawing tool and they are also is null.

[NinjaTrader_ChelseaB]

Hello yyesyyesyyes,

This would be undocumented and unsupported, so there is no official direction I can provide.

First, have you actually made a drawing tool script, or have you simply declared an empty class with the name MyDrawingTool?

In other words, can you manually draw your custom drawing tool on a chart?

Next, calling new DrawingTool() would not be correct.
You would want to pass a string with the fully qualified namespace of the drawing tool, or use the core to invoke a new instance.

https://forum.ninjatrader.com/forum/historical-beta-archive/version-8-beta/89695-is-it-possible-to-draw-objects-on-chart-through-addon?p=751198#post751198

https://forum.ninjatrader.com/forum/ninjatrader-8/add-on-development/1147656-activate-native-ninjatrader-drawing-tool-mode?p=1147807#post1147807

[yyesyyesyyes]

MyDrawingTool is child of DrawingTool.
myDrawingTool.GetType().FullName is getting full name and it is properly drawing on chart.

Is it possible to get all drawing tools that are currently on chart?

[NinjaTrader_ChelseaB]

Hello yyesyyesyyes,

All drawing objects on the chart would be in the DrawObjects collection.

https://ninjatrader.com/support/helpGuides/nt8/drawingtools_drawobjects.htm

[yyesyyesyyes]

Thanks!
One last question:
Is there is a way just place a drawing on the chart programmatically (not TryStartDrawing)? All inner objects is initialized and all chart anchors is correctly setted I just want to add this drawing tool to the chart

Thanks

[NinjaTrader_ChelseaB]

Hello yyesyyesyyes,

Injecting a drawing object on a chart would not be supported, and unfortunately, I do not have any unsupported sample code that achieves this I can provide.

You can draw from an indicator applied to the chart.

https://forum.ninjatrader.com/forum/historical-beta-archive/version-8-beta/89695-is-it-possible-to-draw-objects-on-chart-through-addon?p=751198#post751198

[Leeroy_Jenkins]

Might be stupid idea but you can try to set cursor on desired x;y position, "press" hotkey for your drawing, and then "click" left mouse button or set another anchor price if you need than one. That's all within visible chart unfortunately.